Tick, tock. Daylight Saving Time begins at 2 a.m. on the second Sunday in March and ends on the first Sunday in November at 2 a.m. You know the drill: In the spring, turn clocks ahead one hour; in the fall, turn them back an hour. While you're at it, delight your friends with the following DST dossier.

The name is a singular sensation

It’s Saving, not Savings, time — and it’s designed to make better use of morning hours and shrink energy bills. But it also means that you can go for a run after work outdoors and it’s still sort of light out in warmer weather. Respect, people. Say it right.

An American in Paris had the bright idea 233 years ago

Spring ahead: Daylight Saving Time begins on March 12, 2017, at 2 a.m.

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Inventor and statesman Benjamin Franklin pitched the notion of waking up an hour earlier to save on candles as a delegate in France in 1784. He wrote about it in an essay — “An Economical Project for Diminishing the Cost of Light” — to the editor of The Journal of Paris. It was a long time before the idea was actually established. Port Arthur — now called Thunder Bay — in Ontario, Canada, became the first location to use DST in July 1908.

Benjamin Franklin came up with an early version of Daylight Saving Time in the late 18th century.

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DST was introduced in the U.S. in 1918 when President Woodrow Wilson signed the Standard Time Act into law. It’s been something of a bumpy ride since. DST was repealed a year later, but parts of the U.S. continued to observe it. Which meant headaches for transportation and broadcasting businesses. In 1966, Congress enacted the Uniform Time Act, which ensured that states observing DST began and ended the time adjustment on the same dates. Start and stop dates have changed over time. Since 2007, DST has been bookended by the second Sunday in March and the first Sunday in November.

Ticker tock: DST is linked with cardiac events

Cardiac events spike around Daylight Saving Time.

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Springing ahead on Sunday and losing an hour of sleep boosted the risk of having a heart attack on the following day by 25%, compared to other Mondays during the year. So said a 2014 study by the University of Colorado in Denver. Tread lightly. And go to bed a little earlier.

Trick or treating and Daylight Saving Time share history.

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Through 2006, DST began the first Sunday in April and ended the last Sunday in October — a couple days before Halloween. Candy makers spent decades lobbying for DST to extend beyond Halloween. Why? Young trick-or-treaters going door-to-door collecting Kit Kats and such aren’t allowed out after dark.

Fido, Fluff and even Elsie may be a little off when DST kicks in

Daylight Saving Time can affect pets and livestock.

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Some animals are so in sync with their owners' schedules that the one-hour spring forward can cause some confusion. No surprise that impacts cats and dogs — but farm animals aren’t immune. “Cows become accustomed to being milked at particular times of day,” a researcher told livescience.com.

DST is seen as too much of a good thing in some U.S. states

Arizona, Hawaii, and the territories of Puerto Rico, Virgin Islands, and American Samoa do not use DST. They get enough sunshine in these spots already, thanks. An added hour of light in the summertime isn’t seen as a plus.

DST dilemmas go beyond grogginess and being late for brunch

On Nov. 4, 2007, Laurie Cirioli of North Carolina gave birth to twins — Peter at 1:32 a.m. and, 34 minutes later, to Allison. So Peter’s the firstborn. Uh, no. Daylight Saving Time reverted to Standard Time at 2 a.m. Which means Allison was born at 1:06 a.m. So she’s the alpha kid. Grist for sibling rivalry? Dad Jason Cirioli said at the time: “We’ll let them work that out between themselves.” We checked in to see how things are going. “Our kids are third graders now. I don’t think they quite understand Daylight Saving Time,” Laurie, a preschool teacher told the Daily News. “They get along so well. I can’t imagine this ever being an issue.”